Jacket for lamp-chimneys



(No'ModeL) I T. MQGOWAN.

JAGKET FOR LAMP GHIMNEYS.

PatentedOct. 8, 1889.

Z Z 5 h m M .T

Bjlw ezifiz e yyezt UNITED STATES PATENT OFFICE.

THOMSON MCGOWAN, CLEVELAND, OHIO.

JACKET FOR LAM P-CHIM N EYS.

SPECIFICATION forming part of Letters Patent No. 412,406, dated October8, 1889.

Application filed February 28, 1889. Serial No. 301,544. (No model.)

To all whom it may concern:

I Be it known that I, THoMsoN McGoWAN, of Cleveland, in the county ofGuyahoga and State of Ohio, have invented certain new and usefulImprovements in Jackets for Lamp- Chimneys; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same.

My invention relates to an improved jacket for lamp-chimneys, in which atransparent or at least translucent jacket is employed, surrounding thechimney and sealed to and at the top and bottom of the chimney toexclude air from outside the chimney to prevent condensation of theproducts of combustion on the inner surface of the chimney, by reason ofwhich any illuminating-oil may be burned in the lamp without smoking thechimney.

In the accompanying drawings, Figure 1 is a side elevation in section.Figs. 2 and3 are modifications in vertical section.

A represents a lamp-chimney that in the main may be of any ordinaryform-for instance, as'shown; and 13 represents a jacket surrounding thechimney, and sealed or closed at top and bottom of the latter, so as toexclude the air from between the two.

In Fig.1 the jacket and chimney are shown resting on and supported by aholder 0, in common such holder being imperforate between the jacket andchimney and fitting each air-tight. The top of the chimney,-as shown, isconsiderably smaller in diameter than the adjacent section of thejacket, and a collar D is arranged to fill the space between the chimneyand jacket. This collar is usually of elastic material, so that noaccurate fitting is required to insure tight joints, and the undersurface of the collar should be of light color and smooth surface, so asto serve as a reflector to throw the light downward, and at the sametime, according to the form thereof, to deflect the light more or lessoutward.

The jacket is usually but not necessarily of glass. Any suitablematerial that is trans parent, or at least suiiiciently translucent,will answer the purpose. The object of the jacket is to exclude theatmosphere from the outside of the chimney, and thereby prevent thecondensation of the products of combustion on the inner surface of thechimney, or, in common parlance, to prevent smoking the chimney.

I will state as a matter of fact that with my improved jacket attachedto the lamp-chimney I have burned a lamp during sixteen consecutivehours without the chimney showing the slightest signs of smoke, andbeing apparently as clear as at the commencement of the experiment.Meanwhile the lamp was burning such impure low cheap grade of oil aswould in a few moments have badly smoked an ordinarily unprotectedchimney.

Various modifications may be employed Without departing from the spiritand purpose of my invention. For instance, in Fig. 2 the chimney isshown with a broad external flange b at the base thereof that engagesthe jacket, and the joint may be made tight for instance, by grinding,cementing, fusing, or other suitable means. In Fig. 3 the up per end ofthe chimney is shown but little less in size than the adjacent sectionof the jacket, and the chimney is provided with one or more grooves 19for holding packing,whereby a tight'joint with the jacket is insured. Itis probable that practical means may be found for making the chimney andjacket integral at the bottom, in which case it would be only necessaryto use suitable packing or other meansfor closing the space between thetop of the chimney and jacket,

Good results are attained by closing the airspace between the chimneyand jacket at the bottom only to prevent a circulation of air throughsuch space.

l. The combination, with a lamp-chimney, of a jacket surrounding thechimney leaving an air space between the two, such space beinghermetically sealed at both top and bottom, substantially as set forth.

2. The combination, with a 1a1np=chimney, of a jacket surrounding thechimney leaving an air-space between the two, such spe ce be- Intestimony whereof I sign this specificainghermetically sealed at thebottom and havtion, in the presence of two Witnesses, this ing apacking-ring between the jacket and 18th day of December, 1888.

chimney at or near the top of the latter for THOMSON MCGOWAN. 5 closingsuch air-space at the top, such pack- Witnesses:

ing-ring being adapted to serve as a reflector, CHAS. H. DORER,

substantially as set forth. ALBERT E. LYNCH.

